C Signedness Check

charint_signcheck.c

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

// Test if char and int are signed or unsigned
int main() {
        // Char test
        printf("Is char signed? ");
        if ((char)-1 < 0)
                printf("YES, char is signed\n");
        else
                printf("NO, char is unsigned\n");
        // Int test
        printf("Is int signed? ");
        if ((int)-1 < 0)
                printf("YES, int is signed\n");
        else
                printf("NO, int is unsigned\n");
        // Print limits
        // Negative values generally indicate signed-ness in type
        printf("CHAR_MIN is %i\n", CHAR_MIN);
        printf("INT_MIN is %i\n", INT_MIN);
        exit(0);
}